Alarm switch mechanism



Dec. 3, 1929. M. BONNELL 1,738,508

ALARM SWITCH MECHANI SM Filed Feb. 10. 1928 ATTORNEY Patented Dec. 3,1929 i ,MORGAN V'isieiviviirnn, orcLARKsvrLnE, rnNNsYnvANmf .A LARQYISWITCH MECHANISML Application filed `February 1 0, 1928;. Serial-No..2535433..

My; invention relatestocertain new and useful improvements,-in'burglar-and lire alarm:l mechanisms and. itv primarily; has forits;` objectl, tof provide a `simple inexpensive .)vayutoyprotectbuildings against unlawful,

entry. and; againstA lire.

Itis anrobjectf of the invention, to, provide.

anralarm mechanism. preferably ofthe open.-

circuit type which can lbe installed in. a. 1building .by almost anyone`having speciali. 'electricalknowledge or. not and' at a cost,`

that is practically nominal;

@then ob]l ectsy will,v n vpart in- 4partzbe pointed outi hereinafter;

b To1the `attainment of. the: aforesaid objectsf andfends, Amyinvention.y consists in the novelV detailsxof construction, andin thecombina:

tion, eonnectionand arrangement of parts,

hereinafter more fully described and the Z'jpointed outv inthe claims. Y

Inithedrawings:

Figure l is.4 adiagrammatic perspective viewy ofa portion ofa roomillustrating-the applicationof myl invention.

2li. view-fof'one-.of the f circuit making and breaking members andtheconductor wires on which the same is mounted and with which itcooperates to open and close the w circuit from battery to bell FigureBis a detail sectional view of a part of my invention.

In the drawing in which like numerals of reference indicate like partsin all the liggffures, l represents the walls of the room, 2

a door and 3 a window.

In carrying out my invention I run a pair of parallel insulating wireslf-ta around such portions of the room as are nto be protected, andabove the door and window I remove a portion of the insulation from eachwire. The lower wire is connected to one of the terminals v5 of thesignal (bell or other suitable signal) and Mathe other terminal of whichis electrically connected to the battery 6 or other source of electricalenergy. The upper wire 4 connects to the battery or source of electricalenergy 6 also.

5&1 Mounted on the portion 7 of the lower l0 whichisjso arranged thatiti can be Figure 2 is an enlarged detail perspective wirel fromwhichtheinsulationA has been yremoved. is al bell` crank circuit closer 8,`which may consistof astout wirebenttof form bearing earsfSaandfngersband189, the finger 8br lying." between theV insulation portionl 7. of.the, upper wire 4 and thev wall and adapted by` gravity. to. fallAover-intor contactwith the upper wire and` close the signal circuit.When thejpartto be protected is. the door that door. is .provided-A witha cleatj9 which servestofhold the mem-,j

. ber 8 inV the circuit-open'position when theUV beobvious .and

door is closed but will permit it to. move to` the circuit-closedposition asy soon, as` the door is partiallyy opened.

In order that lthe member 9 protecting the door may be. renderedinoperativey dur ing suchtimes as the occupants of the., building aredesirous. ofrleavingVv the door unprotectedI provide aI turnable membera moved inA one position tohold themember 8- in acircuit-hopen;condition and. can be moved tol` anotherv position` to'A` allow thatymember jto function properly- When the invention n is used in.,connection with thefwindow to'be protected If provide a pivoted leverllmounted.- onthe window-.- Y framefin position,tobeengaged by a` fingen12 securedtothe movablewindow sashland'soV connect the;` lever ll-`l byanrod-likef. connecy tion 13 to the member 81 sothatuwhenthe; windowisfV closed. the finger-1 12-y will Apush on one end of theleven11,;thereby" raising thel other end and; causing; the rod y113 tohold;8D. thev memben 8- inthe` circuit-open position. -v As soon, howeven,asi/the window is.slightly raised gravity acting/oir.r the overweightedend of the lever 11:l willfpermit it tiomove to allowthe member 8to-close tl'ie'ngerg,

Inl order,v to, employmy invention as a., fireY alarm: Iprovidefaffusiblef orl burfnablel member le: andy connect it. by.;y afvrodflilae` member 15 with: a member 8 soi that the` memberr 14:l willhold thevrodl upA and:A thel memben 8 inthe; cineuitfopen positionunder.- normal; position, but, upon; burningorf fusing` the member.lewill: permit? the: rodi. L5A y todrop; thereby` permitting the 1.member 8 to` gravftateto: ythe Ycircuit-closed position.

It is obvious from the foregoing that the signal and source of energy 5and 6 respectively ma be placed either inside of the room or uildingbeing protected, or the same may be located at a distant point, as forinstance in a central protective agency or police or fire station.

From the foregoing description it is thought the construction, operationand advantages of my invention and its extreme simplicity Will beunderstood by those skilled in the art to Which it relates.

What I claim is:

1. In electrical alarm mechanism, a pair of insulated conductor Wireshaving portions exposed, means for securing said Wires adjacent theexposed portions to hold said Wires approximately parallel, a circuitmaking and breaking member pivotally mounted on one Wires exposedportion and itself having a portion adapted to be brought into contactWith the other Wires `exposed portion at times, and means for operatingsaid circuit making and breaking member the insulation of said Wiresserving as limiting abutments to restrain said circuit making andbreaking member against substantial movement along said Wires.

2. In electrical alarm mechanism, a pair of insulated conductor Wireshaving portions exposed, means for securing said Wires adjacent theexposed portions to hold said Wires approximately parallel, a circuitmaking and breaking member pivotally mounted on one Wires exposedportion and itself having a portion adapted to be brought into ContactWith 'the other Wires exposed portion at times, means for operating saidcircuit making and breaking member, said circuit making and breakingmember comprising a Wire provided With tWo spaced eye portions by Whichit is mounted, a contacting finger portion, and an operating leverportion, the insulation of said Wires serving as limiting abutments torestrain said circuit making and breaking member against substantialmovement along said Wire.

3. In an electrical alarm mechanism which includes a pair of conductorWires, the combination With such Wires, of a circuit making and breakingmember pivotally mounted on one of said Wires and in electrical contacttherewith and itself having a portion adapted to be brought intoelectrical contact with the other Wire at times by gravity, a movablemeans having provision normally holding said member in the circuit-openposition and adapted to become disengaged therefrom when in an abnormalposition, and other means associated with the adjacent structure torender such member inoperative at Will.

4. In an electrical alarm mechanism which includes a pair of conductorWires, the combination with such Wires, of a circuit making and breakingmember pivotally mounted on one of said Wires and in electrical Contacttherewith and itself having a portion adapted to be brought intoelectrical Contact With the other Wire at times by gravity, a movablemeans having provision normally holding said member in the circuit-openposition and adapted to become disengaged therefrom When in an abnormalposition, and other means associated with the adjacent structure torender such member inoperative at will, said last named means comprisinga member operable to engage with said circuit opening and closing memberto hold it against the action of gravity.

5. In an electrical alarm mechanism, a pair of insulated conductor Wireshaving portions exposed, means for securing said Wires adjacent theexposed portions and to one side of the part to be protected by thealarm mechanism and holding said Wires approximately parallel, a circuitmaking and breaking member consisting of a Wire bent into an approximateU-shape with the legs of the U twisted around the exposed portion of oneof said Wires and spaced apart to form a pivot, one of said legs beingextended to provide a finger to engage the exposed portion of the otherWire when said circuit making and breaking member is in one position,the other leg of said U-shaped member being extended, and meansassociated with said last named extended leg for holding said circuitmaking and breaking member in the circuit open position, and meanscooperating With the U-shaped portion of said circuit making andbreaking member normally to hold said member in the circuit-openposition, said circuit making and breaking member adapted to move to thecircuit-closed position by gravity.

MORGAN BONNELL.

